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<b>let </b><font color="Maroon">c<sub>1</sub></font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/>

<b>take </b>
<span class="p1">(<span class="default"><a href="subset_1.html#K2">[#]</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="rfunct_3.html#K5" target="_self">--&gt;</a> 0
; <i><font color="Red">:: according to </font></i><a class="ref" href="setwiseo.html#D2">SETWISEO:def 2</a><br/>

<b>thus </b><a NAME="E1:31"/>
<span class="p1">(<span class="default"><a href="subset_1.html#K2">[#]</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="rfunct_3.html#K5" target="_self">--&gt;</a> 0 <a href="binop_1.html#R3">is_a_unity_wrt</a>  <a href="rfunct_3.html#K14" target="_self">addpfunc</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="ref" href="rfunct_3.html#T18" target="_self">Th18</a></i>;<br/>


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